Hee! I've been changing the colour for about four years now and I've pretty much always done it at home. The only really bad one I ever did was when it went black - and even then it wasn't *too* bad.

I dyed it dark brown 'cause I was dressing up as Faith (I kid you not, I permanently coloured my hair for a fancy dress costume) at a convention and it ended up so much darker than I thought it would - and my scalp ended up black as well. And... I don't tan well, so the one (and so far only) time I met Nick Brendon I was peely-wally with long black hair and a dyed head.... *g*